1. Department of Radiation Oncology; Severance Hospital; Yonsei University College of Medicine; Seoul Korea
2. Department of Radiation Oncology; Asan Liver Center; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
3. Department of Radiation Oncology; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
4. Department of Medical Device Management and Research; SAIHST; Sungkyunkwan University; Seoul Korea
5. Center for Liver Cancer; Research Institute and Hospital; National Cancer Center; Goyang Korea
6. Department of Radiation Oncology; Gangnam Severance Hospital; Yonsei University College of Medicine; Seoul Korea
7. Department of Radiation Oncology; Chonnam National University Medical School; Gwangju Korea
8. Department of Radiation Oncology; Seoul National University College of Medicine; Seoul Korea
9. Department of Radiation Oncology; Seoul St. Mary's Hospital; The Catholic University of Korea; Seoul Korea
10. Department of Radiation Oncology; Dongsan Medical Center; Keimyung University School of Medicine; Daegu Korea
11. Department of Radiation Oncology; Korea Institute Radiological & Medical Sciences; Seoul Korea
12. Department of Radiation Oncology; Ansan Hospital; Korea University Medical Center; Ansan Korea
13. Department of Biostatistics; Yonsei University College of Medicine; Seoul Korea